Process for manufacturing heavily stressed valve spring

A technology of valve spring and manufacturing process, which is applied in the field of manufacturing process of high-stress valve spring, can solve the problems of free length fluctuation of walking spring and high product manufacturing cost that affect the quality, concentricity and helix angle of spring products, and achieve quality improvement and Product qualification rate, production cost reduction, and the effect of concentricity improvement
CN101439458AActive Publication Date: 2009-05-27SHANGHAI SPRING CORP
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
SHANGHAI SPRING CORP
Publication Date
2009-05-27

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Abstract

The invention provides a manufacturing process used for a high-stress valve spring, which can improve the quality and product qualification ratio of the spring product, reduce the production cost of the spring and comprises the processes as follows: spring rolling: steel wire blanks are rolled and made into semi-finished springs; primary temper: the spring is tempered at low temperature so that the stress is removed; spring grinding: two end surfaces of the spring are grinded so as to achieve the required length; chamfering: the burrs of the grinded spring are removed; stress optimization: secondary temper: the spring is tempered again at low temperature so that the stress is removed; shot blasting which is used for prolonging the service life of the spring; hot-pressing; load classification: the spring with bad load is removed and the product with qualified load is used as the high-stress valve spring product; oiling: the high-stress valve spring is oiled; and is prepared for packaging. The process improves the quality and the qualification ratio of the spring product and reduces the production cost of the spring as the working procedure of length classification is saved and the stress optimization process is arranged after the process of spring grinding and chamfering in the traditional process.
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Description

technical field

[0001] The invention relates to a manufacturing process of a valve spring, in particular to a manufacturing process of a high-stress valve spring. Background technique

[0002] High-stress valve springs are used in supercharged gasoline direct injection automotive engines. This type of engine has low fuel consumption and high power, which can reach more than 110 kilowatts. Therefore, high-quality, low-cost high-stress valve springs are required.

[0003] see figure 1 , figure 1 Process flow chart for conventional high stress valve spring manufacturing.

[0004] The manufacturing process of traditional high-stress valve springs is:

[0005] Coil spring β†’ stress optimization (SOF in the industry) β†’ tempering β†’ length sorting β†’ spring grinding β†’ chamfering β†’ first shot peening β†’ second shot peening β†’ hot pressing β†’ load classification β†’ oiling.

[0006] The main steps in the above flow will be described below.

[0007] The coil spring process is to roll th...

Claims

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